When I read this question I don't necessarily think of someone who gets good grades. Yes, it's a factor but some people get good grades by many ways. A good student has focus. Enough focus to get as much as they choose to take in. They can focus through daily noises in a classroom and this is at their advantage. Good communication skills is another. Opening up to a teacher about how you feel or if you may be struggling and finding out how to communicate with them is great. Next would be motivation. This can accomplish many things. Not only through school but for the future. Regardless of why someone is motivated to be learning, it is important-- you're the future.